Predictive validity of the Japanese version of Postpartum Depression Predictors Inventory-Revised (PDPI-R) during pregnancy and the postpartum period Mikiyo Wakamatsu, Masayuki Nakamura, Motofumi Kasugai, Hiroshi Kimotsuki, Toshimichi Oki, Yuji Orita, Shinichi Togami, Hiroaki Kobayashi, Akira Sano, Tsutomu Douchi Medical Journal of Kagoshima University September, 2016 Med. J. Kagoshima Univ., September, 2016 Predictive validity of the Japanese version of Postpartum Depression Predictors Inventory-Revised (PDPI-R) during pregnancy and the postpartum period Mikiyo Wakamatsu1,*), Masayuki Nakamura2), Motofumi Kasugai2), Hiroshi Kimotsuki2), Toshimichi Oki3), Yuji Orita3), Shinichi Togami3), Hiroaki Kobayashi3), Akira Sano2), Tsutomu Douchi3) Affiliation: 1) Department of Maternal & Child Nursing and Midwifery, Kagoshima University Faculty of Medicine, School of Health Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan. 2) Department of Psychiatry, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan. 3) Department of Reproductive Pathophysiology, Obstetrics and Gynecology, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan. (Received 2016 Mar. 4; Revised June. 7; Accepted Jaly. 12) *Address to Correspondence Mikiyo Wakamatsu Department of Maternal & child Nursing and Midwifery Kagoshima University Faculty of Medicine School of Health Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan. E-mail: [email protected] Tel: +81-99-275-6792; Fax: +81-99-275-6792 Abstract Aim: To identify the risk factors for postpartum depression (PPD) during pregnancy and the early postpartum period is considered important for preventing the development of PPD. Postpartum Depression Predictors Inventory-Revised (PDPI-R, self-report questionnaires) was developed from Beck’s updated meta-analysis and correlated with the development of PPD. The purpose of the present study was to investigate the predictive validity of the Japanese version of PDPI-R during pregnancy and one month after delivery. Materials and methods: Pregnant Japanese women (n=192) participated in this study between December 2012 and February 2015 at the Department of Obstetrics and Gynecology, Kagoshima University Hospital and three practitioners in Kagoshima prefecture, all of which are located in the southern part of Japan. Subjects were 120 pregnant Japanese women who completed PDPI-R during 1023 weeks of gestation and one month postpartum. All subjects delivered full-term healthy babies. PPD symptoms were measured by the Edinburgh Postnatal Depression Scale (EPDS) one month after delivery. The predictive validity of the Japanese version of PDPI-R was investigated. After identifying appropriate cut-off values by carrying out a receiver operating characteristic (ROC) curve, sensitivity, specificity, positive and negative predictive values, and the accuracy of PDPI-R were determined in both versions. Results: Twelve (10%) out of 120 mothers met the PPD criteria with EPDS scores of 9 or higher. With a prenatal cut-off value of 〔10〕 Med. J. Kagoshima Univ., September, 2016 7.0 after carrying out a ROC curve, the sensitivity and specificity of PDPI-R were 50.0% (6/12) and 87.0% (94/108), respectively. The positive and negative predictive values of PDPI-R were 30.0% (6/20) and 94.0% (94/100), respectively. The cut-off value of 7.0 was superior to 6.0 and 8.0. With a postpartum appropriate cut-off value of 8.0, sensitivity and specificity were 66.7% (8/12) and 88.0% (95/108), respectively. The positive and negative predictive values were 38.1% (8/21) and 96.0% (95/99), respectively. The cut-off value of 8.0 was superior to 7.0 and 9.0. Conclusions: The Japanese version of PDPI-R is a useful instrument for predicting PPD in not only the postpartum period, but also the prenatal period. An appropriate cut-off value of PDPI-R may be 7.0 in the prenatal version and 8.0 in the postpartum version. Key words: cut-off value, Edinburgh Postnatal Depression Scale, Japanese version, Postpartum Depression, Postpartum Depression Predictors Inventory-Revised, risk factor, sensitivity, specificity Introduction Materials and methods Postpartum depression (PPD) is a global phenomenon Fully informed written consent was obtained from each that has been reported in 10-15% of mothers in Western pregnant woman. This study was conducted in accordance countries.1), 2) Suicides were previously shown to account for with the Institutional Review Board (No.288) at Kagoshima 3) up to 20% of deaths during the postpartum period. PPD has University Hospital and the Helsinki Declaration, 2013. been implicated in a number of these tragic cases. It has also The Japanese version of PDPI-R was used after obtaining been shown to affect a partner’s mental health and child’s permission from Beck CT. PDPI-R was translated from socio-psychiatric development,2, 4) and has been associated English into Japanese by psychiatrists and a midwife, then with child neglect and abuse. 5, 6) Although every pregnant woman is at risk of developing PPD, those with specific risk 2, 7) translated back into English by a bilingual doctor. The Japanese version of PDPI-R was completed in consensus. Thus, Pregnant Japanese women (n=203) participated in this study identifying the risk factors for PPD during pregnancy and the between December 2012 and February 2015 at the Department early postpartum period is considered important for preventing of Obstetrics and Gynecology, Kagoshima University Hospital the development of PPD. Postpartum Depression Predictors and three practitioners in Kagoshima prefecture, all of which Inventory-Revised (PDPI-R, self-report questionnaires) was are located in the southern part of Japan. Exclusion criteria developed from Beck’s updated meta-analysis8) and correlated included women who refused entry to this study (n=11), factors may be at a higher risk of developing PPD. 9-11) Compared with PDPI-R, those who had a past history of medically-treated psychiatric the other instrument developed by Webster et al. does not disorders including (postpartum) depression (n=4), those who assess factors including socio-economic status, marital status, could not understand Japanese, (n=1) and those who dropped child care stress, life stress, and prenatal depression, and is out (n=67). Drop out cases included premature delivery (n=3), 12) intrauterine fetal death (n=1), and incomplete PDPI-R (n=63). In previous screening instruments summarized by Ikeda et Incomplete PDPI-R cases were almost all in postpartum with the development of PPD. only used in the postpartum period, not during pregnancy. 13) several items adopted in PDPI-R women due to being busy with childcare. Thus, 120 women were absent. PDPI-R has the advantage of being the only were enrolled in this study. All subjects completed PDPI-R al. and Beck et al. 8, 14) prenatal screening scale. 8, 14) In Japan, there have been no prenatal instruments to predict PPD. Therefore, the purpose of the present study was to (self-report questionnaires) during 10-23 weeks of gestation and one month postpartum. Gestational age at the first survey was 17.3 weeks (SD = 4.2). investigate the clinical usefulness of the Japanese version All subjects delivered full-term healthy babies. Baseline of PDPI-R and determine its predictive validity during the characteristics included age, gestational age, marital status, prenatal and postpartum periods. employment status, socio-economic status, and parity. PDPI-R during 10-23 weeks of gestation included 10 items: 1) marital status, 2) socio-economic status, 3) self-esteem, 4) prenatal depression, 5) prenatal anxiety, 〔11〕 Japanese version of PDPI-R 6) unplanned/unwanted pregnancy, 7) history of previous as 1, while its absence was registered as 0. After identifying depression, 8) social support, 9) marital dissatisfaction, and appropriate cut-off values by carrying out a receiver operating 10) life stress. characteristic (ROC) curve, sensitivity, specificity, positive Total scores on the prenatal version of PDPI-R ranged and negative predictive values, and the accuracy of PDPI-R from 0 to 32. Three additional items were included in the were determined in both versions. P<0.05 was considered postpartum PDPI-R examination one month after delivery: 11) significant. Statistical analyses were performed using SPSS, child care stress, 12) infant temperament, and 13) maternity version 22 (IBM, Armonk, NY, USA). blues. Total scores on the postpartum version ranged from Results 0 to 39. PPD symptoms were measured by the Edinburgh Postnatal Depression Scale (EPDS) 15) one month after delivery. Women with EPDS scores of 9 or higher were suspected of PPD in the Japanese criteria.16-18) Twelve (10.0%) out of 120 mothers met the PPD criteria with EPDS scores of 9 or higher. Table 1 shows the baseline characteristics of the enrolled subjects (n=120). The Statistical analysis percentages of primiparous and married women were 51.7%, and 89.2%, respectively. Only 2.5% of the women were Intra- and inter-group comparisons were performed by the single. A quarter of the women (24.2%) had a low socio- McNemar test, Wilcoxon rank-sum test, and Mann-Whitney economic status. No significant differences were observed in U test, as appropriate. Relationships between variables were the distribution of marital status, employment status, socio- assessed by the Spearman rank correlation test. A univariate economic status and parity between the two groups. Mean logistic regression analysis was used to determine the odds age was 30.1 years (SD=4.6). ratio of 13 items in the development of PPD. The strength of Table 2 shows changes in risk factor scorings of PDPI-R the odds ratio was explained as a 95% confidence interval (CI). during pregnancy and the postpartum period in all subjects. In this analysis, the independent variable was the presence The low self-esteem variable was significantly different or absence of PPD (non-PPD), while the dependent variables between the pregnancy and the postpartum periods (p<0.05). were the 13 items tested. The presence or absence of PPD was No significant differences were observed in the other 9 a nominal variable, and the presence of PPD was registered variables between the two time points. Table 3 shows the Table 1 Baseline characteristics of enrolled subjects (n=120) n (%) PPD non-PPD p (Fisher’s exact test) Single Married Separated Partnered 3 (2.5) 107 (89.2) 1 (0.8) 9 (7.5) 1 10 0 1 2 97 1 8 0.474 Housewife Employed Part-time Self-employed 48 (40.0) 53 (44.1) 17 (14.2) 2 (1.7) 3 7 2 0 45 46 15 2 0.593 Socio-economic status Low Medium High 29 (24.2) 90 (75.0) 1 (0.8) 4 8 0 25 82 1 0.304 Parity 0 1 2 3 62 (51.7) 45 (37.5) 11 (9.2) 2 (1.7) 7 3 1 1 55 42 10 1 0.450 Marital status Employment status 〔12〕 Med. J. Kagoshima Univ., September, 2016 Table 2 Changes in risk factor scorings of PDPI-R during pregnancy and the postpartum period (n=120) Median (range) † / Number (%) Range Prenatal variables F1 Being single F2 Low socio-economic status F3 Low self-esteem ǂ 0-1 0-1 0-3 F4 Perinatal depression F5 Prenatal anxiety F6 Pregnancy intendedness § 0-1 0-1 0-2 F7 Prior depression F8 Lack of social support // F9 Marital dissatisfaction ¶ F10 Life stress ** Postpartum variables F11 Child care stress †† 0-1 0-12 0-3 0-7 0-3 F12 Infant temperament §§ 0-3 F13 Maternity blues 0-1 * ǂ § // ¶ ** †† §§ During pregnancy 1 2 3 1 2 1 2 3 1 2 1 2 3 3 (2.5) 29 (24.2) 23 (19.2) 24 (20.0) 7 (5.8) 12 (10.0) 74 (61.7) 41 (34.2) 2 (1.7) 10 (8.3) 0 (0-8) † 18 (15.0) 2 (1.7) 2 (1.7) 0 (0-3) † One month postpartum p (McNemar Wilcoxon) 1 (0.8) 25 (20.8) 27 (22.5) 15 (12.5) 5 (4.2) 19 (15.8) 71 (59.2) 41 (34.2) 2 (1.7) 11 (9.2) 0 (0-7) † 18 (15.0) 5 (4.2) 0.625 0.523 0.018* 0 (0-4) † 0.800 0.167 0.749 0.987 0.705 0.228 0.859 28 (23.3) 8 (6.7) 52 (43.3) 22 (18.3) 3 (2.5) 51 (42.5) p < 0.05 Do you feel good about yourself? Do you feel worthwhile? Do you have good qualities? Was the pregnancy planned? Was the pregnancy unwanted? Do you believe that you receive adequate emotional support from your (partner/family/friends)? Do you believe that you can confide in your (partner/family/friends)? Do you believe that you can rely on your (partner/family/friends)? Do you believe that you receive adequate instrumental support from your (partner/family/friends)? Are you satisfied with your marriage or living arrangement? Are you currently experiencing any marital relationship problems? Are things going well between you and your partner? Are you currently experiencing any stressful events in your life such as (financial problems/marital problems/death in family/unemployment/ serious illness in family/moving/job change)? Is the infant experiencing any health problems? Are you having problems feeding the baby? Are you having problems with the baby sleeping? Would you consider the baby irritable? Does the baby cry a lot? Is your baby difficult to console or soothe? 〔13〕 Japanese version of PDPI-R Table 3 Distribution of Postpartum Depression cases at two time points during pregnancy Gestational age 10-16 weeks n (%) Gestational age 17-23 weeks n (%) P (Chi-square test) 4 (7.7) 48 (92.3) 8 (11.8) 60 (88.2) 0.461 PPD non-PPD Table 4 Total PDPI-R scores in PPD and non-PPD women at two time points Prenatal version Postpartum version med. PPD (n=12) min. max. med. 6.50 8.00 2 3 16 17 3.00 4.00 non-PPD (n=108) min. max. 0 0 p (Mann-Whitney U test) 13 17 < 0.05 < 0.001 Table 5 Odds ratio of PDPI-R variables in the development of PPD During pregnancy Odds Ratio 95% Cl Prenatal version F1 Being single F2 Low socio-economic status F3 Low self-esteem F4 Prenatal depression F5 Prenatal anxiety F6 Pregnancy intendedness F7 Prior depression F8 Lack of social support F9 Marital dissatisfaction F10 Life stress Postpartum version F11 Child care stress F12 Infant temperament F13 Maternity blues 4.82 1.58 1.67 1.96 3.18 0.84 1.14 1.29 2.26 1.50 One month postpartum Odds Ratio 95% Cl 0.40 - 57.50 0.44 - 5.66 0.95 - 2.95 0.38 - 10.22 0.66 - 15.24 0.25 - 2.76 0.13 - 9.95 0.99 - 1.69 1.04 - 4.90* 0.70 - 3.19 NA 2.07 2.92 5.22 3.85 1.62 1.00 1.43 2.30 1.58 NA 0.57 - 7.54 1.56 - 5.45† 1.44 - 18.88* 0.81 - 18.43 0.55 - 4.76 0.12 - 8.65 1.08 - 1.89* 0.93 - 5.67 0.88 - 2.83 2.10 1.87 4.71 0.91 - 4.84 0.91 - 3.86 1.21 - 18.42* * p < 0.05 † p < 0.01 CI = confidence interval NA = not available Table 6 Spearman rank correlation test between variables in the prenatal version (n=120) Total score Total score F3 Self-esteem F4 Prenatal depression F5 Prenatal anxiety F6 Unplanned/unwanted pregnancy F7 History of previous depression F8 Social support F9 Marital dissatisfaction F10 Life stress * p < 0.05 † p < 0.01 ns = not significant 1 0.567† 0.128 0.279† 0.294† -0.047 0.717† 0.432† 0.391† F1 F2 F3 F4 ns ns 1 ― ns 1 - ns - - - 0.208* ns ns ns ns - - - ns ns 0.228* ns 0.190* ns 0.201* 0.188* ns 0.191* ns ns F5 F6 F7 1 ns - ns ns ns 1 ns ns ns ns 1 ns ns ns F8 F9 1 0.307† 1 0.250† 0.271† F10 1 〔14〕 Med. J. Kagoshima Univ., September, 2016 distribution of the postpartum depression casas at two time of 8.0. The postpartum cut-off value of 8.0 was superior to points during pregnacy. The distribution of PPD was not 7.0 and 9.0. The positive and negative predictive values were significantly different between the two time points. Table 38.1% (8/21) and 96.0% (95/99), respectively. The positive 4 shows total PDPI-R scores in PPD (n=12) and non-PPD predictive cut-off value of 8.0 was superior to 7.0 and 9.0. In women (n=108) at the two time points. In the prenatal addition the postpartum version was superior to the prenatal PDPI-R version, median scores were higher in PPD than in version (38.1% and 30.0%, respectively.). non-PPD women. In the postpartum version, median scores Discussion were also higher in non-PPD women. Median scores were higher in the postpartum version than in the prenatal version in both groups. The spearman rank correlation test between total The prevalence of PPD is suggested to vary with the PDPI-R scores at two time points. The prenatal version was mother’s background including age, parity, educational level, positively correlated with the postpartum version (r=0.394, socio-economic status, marital status, social support, culture, p<0.001). geography, and race.7) It may also differ based on the number Table 5 shows the odds ratio of PDPI-R items in the of women with a past history of depression and the cut-off development of PPD from a univariate logistic regression value of EPDS.13, 19-23) The cut-off value of EPDS is generally analysis. In the prenatal version, marital dissatisfaction was higher in Western countries19, 21-23) than in Japan.16-18) However, identified as a significant predictor of PPD (Odds ratio; 2.26, accumulating evidence has indicated that the prevalence of 95% CI; 1.04-4.90, p<0.05). In the postpartum version, low PPD is similar.14, 16, 17, 24-26) In the present study, the prevalence self-esteem (odds ratio; 2.92, 95% CI; 1.56-5.45, p<0.01), of PPD determined based on EPDS scores of 9 or higher was prenatal depression (5.22, 1.44-18.88, p<0.05), lack of 10.0%. This prevalence rate was not different from previous social support (1.43, 1.08-1.89, p<0.05), and maternity blues findings.14, 17, 24, 25, 27, 28) (4.71; 1.21-18.42, p<0.05) showed significant high odds In the prenatal PDPI-R version, a history of depression, ratios. Tables 6 and 7 show the results of the Spearman current depression/anxiety, and low level of partner support rank correlation test between variables in the prenatal and have been associated with the occurrence of PPD.7) Current postpartum versions. In the prenatal version, low self- depression/anxiety may be amenable to change and, thus may esteem positively correlated with the lack of social support be targeted for medical intervention.7) In the present study, (r=0.228, p<0.05), marital dissatisfaction (0.201, p<0.05), among the 10 variables tested, only marital dissatisfaction and total scores (0.567, p<0.01) (Table 6). In the postpartum was identified as a significant predictor of PPD. This result version, prenatal depression was positively correlated with was inconsistent with the findings of Milgrom et al.7) Possible marital dissatisfaction (0.251, p<0.01), and total PDPI-R explanations for this discrepancy include differences in the scores (0.309, p<0.01) (Table 7). Maternity blues positively number of enrolled subjects, subject backgrounds, screening correlated with infant temperament (0.204, p<0.05) and total instruments, and culture. In the present study, marital scores (0.289, p<0.01). dissatisfaction was associated with prenatal depression and After carrying out a ROC curve, appropriate cut-off values the lack of social support in a univariate regression analysis. were identified as 7.0 in the prenatal version and 8.0 in the Therefore, our results did not always disagree with those by postpartum version. Table 8 shows the sensitivity, specificity, Milgrom et al. positive and negative predictive values, and accuracy in The postpartum period is characterized by increased appropriate and nearly appropriate cut-off values in the two susceptibility to different mood disorders of varying versions. With a prenatal cut-off value of 7.0, sensitivity severity.29) This is also supported by the results of the present and specificity were 50.0% (6/12) and 87.0% (94/108), study, which showed that the total PDPI-R score increased respectively. The prenatal cut-off value of 7.0 was superior in the postpartum period in not only PPD, but also non-PPD to 6.0 and 8.0. The positive and negative predictive values women. Maternity blues has been reported in approximately of PDPI-R during pregnancy were 30.0% (6/20) and 94.0% 40-70% of postpartum women within a few days of delivery (94/100) at a cut-off value of 7.0, respectively. The positive in Western countries.30, 31) Although the etiology of maternity predictive cut-off value of 7.0 was superior to 6.0 and 8.0. In blues remains unclear, maternity blues and PPD are common the postpartum version, sensitivity and specificity were 66.7% complications in postpartum women. Previous studies (8/12) and 88.8% (95/108), respectively, with a cut-off value have investigated the relationship between the severity of 〔15〕 Japanese version of PDPI-R Table 7 Spearman rank correlation test between variables in the postpartum version (n=120) Total score F1 Total score F3 Self-esteem F4 Prenatal depression F5 Prenatal anxiety F6 Unplanned/unwanted pregnancy F7 History of previous depression F8 Social support F9 Marital dissatisfaction F10 Life stress F11 Child care stress F12 Infant temperament F13 Maternity blues 1 0.409† 0.309† 0.193* 0.389† 0.145 0.513† 0.270† 0.466† 0.405† 0.458† 0.289† F2 F3 F4 F5 F6 F7 F8 F9 F10 ns ns 1 ns 1 - - 1 - - 0.265† - ns 0.277† ns ns ns ns - - - - ns ns 0.265† ns ns ns ns ns 0.251† ns ns 0.330† 0.188* ns ns ns ns ns ns ns ns ns ns ns ns ― ns - - - 1 ns ns ns ns ns ns ns 1 ns 1 ns 0.251† 1 ns 0.200* ns ns ns ns ns ns ns ns ns - F11 F12 F13 1 ns 1 ns 0.257† 1 ns ns 0.204* 1 * p < 0.05 † p < 0.01 ns = not significant Table 8 Sensitivity, specificity, positive and negative predictive values, accuracy of appropriate and nearly appropriate cut-off values in the two versions Cut-off value Sensitivity Specificity Positive predictive value Negative predictive value Accuracy Prenatal version of PDPI-R 5.0 66.6% (8/12) 6.0 58.3% (7/12) 7.0 50.0% (6/12) 8.0 33.3% (4/12) 9.0 33.3% (4/12) 10.0 8.3% (1/12) 11.0 8.3% (1/12) 72.2% (78/108) 81.5% (88/108) 87.0% (94/108) 89.8% (97/108) 92.6% (100/108) 95.4% (103/108) 97.2% (105/108) 21.1% (8/38) 25.9% (7/27) 30.0% (6/20) 26.7% (4/15) 33.3% (4/12) 16.7% (1/6) 25.0% (1/4) 96.3% (78/81) 94.6% (88/93) 94.0% (94/100) 92.4% (97/105) 92.6% (100/108) 90.4% (103/114) 90.5% (105/116) 70.8% 79.1% 83.3% 84.1% 86.7% 86.7% 88.3% Postpartum version of PDPI-R 6.0 83.3% (10/12) 7.0 75.0% (9/12) 8.0 66.7% (8/12) 9.0 41.7% (5/12) 10.0 33.3% (4/12) 11.0 33.3% (4/12) 12.0 33.3% (4/12) 70.4% (76/108) 80.6% (87/108) 88.0% (95/108) 88.9% (96/108) 91.7% (99/108) 93.5% (101/108) 95.4% (103/108) 23.8% (10/42) 30.0% (9/30) 38.1% (8/21) 29.4% (5/17) 30.8% (4/13) 36.4% (4/11) 44.4% (4/9) 97.4% (76/78) 96.7% (87/90) 96.0% (95/99) 93.2% (96/103) 92.5% (99/107) 92.7% (101/109) 92.8% (103/111) 71.6% 80.0% 85.8% 84.2% 85.8% 87.5% 89.2% maternity blues and the risk of PPD. 10, 11, 17, 20, 27, 30-34) In the support, were associated with the development of PPD in postpartum version, we found that maternity blues was a Korean mothers.20) Beck found that maternity blues was one significant predictor of PPD (odds ratio=4.71) as well as of the important predictors of PPD.10) Thus, we must pay prenatal depression (5.22), low self-esteem (2.92), and the particular attention to mothers with maternity blues in order lack of social support (1.43). Our results were consistent to prevent the development of PPD.14, 17) Similar to maternity with previous findings.8, 10, 11, 17, 20, 24, 27, 31-34) Watanabe et al. blues, prenatal depression, low self-esteem, and the lack of reported that maternity blues was a strong predictor of PPD, social support were identified as significant predictors of PPD. and the higher the blues score, the higher the risk of PPD (odds These results agree with previous findings.13, 19) Thus, we ratio=9.57). 27) Youn et al. also demonstrated that maternity blues, as well as prenatal depression and the lack of social must also pay close attention to women lacking social support and/or with a past history of prior or prenatal depression. 〔16〕 Med. J. Kagoshima Univ., September, 2016 With an appropriate prenatal cut-off value of 7.0, sensitivity 6 months of pregnancy, while Ikeda et al. conducted theirs and specificity were 50.0% and 87.0%, respectively. These at 8 months of pregnancy.13) These differences may have results are consistent with previous findings reported by Ikeda led to slight differences in prenatal cut-off values. Beck et et al.13), but were inferior to those by Oppo et al.19) However, al. previously reported a postpartum cut-off value of 10.5.14) in the study by Oppo et al. PDPI-R was performed at 8 However, PDPI-R was examined at two and six months months of gestation.19) The different timing of PDPI-R may postpartum. PPD occurs four weeks after delivery, and its have led to different cut-off values. With the postpartum cut- risk increases within the first 3 months of delivery.36) Thus, off value of 8.0, sensitivity and specificity were 66.7% and the cut-off value of PDPI-R may become high at two months 88.0%, respectively. Sensitivity was inferior, while specificity postpartum. Additionally, there were 10 to 13 variables in was superior to those reported by Ikeda et al.13) and Oppo et PDPI-R; however, the distribution of each variable may differ 19) The reasons for these discrepancies currently remain with the population examined. In the present study, marital unclear. In the present study, the sensitivity and positive dissatisfaction (odds ratio = 2.26) in the prenatal version, and predictive value of PDPI-R were higher in the postpartum maternity blues (4.71) and prenatal depression (5.22) in the version than in the prenatal version, and this was attributed postpartum version were significant predictors of PPD. Odds to the timing of postpartum PDPI-R being near to the onset ratios of maternity blues and prenatal depression were high, of PPD. The results of the present study demonstrated that despite the lower scale and scoring. When some variables PDPI-R was characterized by higher specificity and a higher with a low scale and scoring, but a high odds ratio, such as negative predictive value. However, a careful follow-up and marital dissatisfaction, maternity blues, prenatal depression, appropriate counselling are necessary for reducing the risk of and prior depression, are one-sided and strong (i.e., high PPD in women with more than an appropriate cut-off value. odds ratio) predictors of PPD, the cut-off value may become In addition, there was a positive correlation in the total score low. Oppo et al. previously reported low cut-off values (4.0 of both prenatal and postpartum versions. Thus, the Japanese in the prenatal and 6.0 in the postpartum version), with high version of PDPI-R is a useful instrument for predicting PPD odds ratios for maternity blues (odds ratio=4.9) and prenatal in not only the postpartum, but also prenatal period. This is depression (9.97),19) and these two variables were given a low important for supporting women at high risk for PPD during scale (0 or 1). In the study by Ikeda et al., the percentages pregnancy. of prenatal depression and prior depression in the prenatal al. We identified appropriate cut-off values of 7.0 in the version were two-fold higer than our values.13) Thus, the prenatal and 8.0 in the postnatal version of PDPI-R. The cut-off value of PDPI-R may differ with the distribution higher postpartum cut-off value was attributed to it having of variables. Furthermore, a previous study reported that more variables. However, disagreements persist with regard the incidence of suicide attempt due to depression differed 13, 14, 19, 35) Possible explanations between the climates in the northern and southern parts of for this discrepancy may include the following. Ikeda et al. Japan.37) Regional variations may exist in the prevalence of reported that an appropriate prenatal cut-off value was 6.0 and PPD even in the same country.38) Thus, cut-off values may 13) be slightly different among the urban and rural, as well as Their postpartum cut-off value was the same ours. Possible southern and northern parts of a country, as shown by the reasons for the slight difference in the prenatal cut-off value present study and by Ikeda et al.13) The accuracy of EPDS may include differences in the number of enrolled subjects, may also be involved in the difference observed in PDPI-R percentage of single mothers, low socio-economic status, and cut-off values. An extreme dominance in false positive cases those with a past history of depression among the enrolled of EPDS in the studied population may be associated with subjects. In the present study, subjects with medically-treated lower PDPI-R cut-off values, while extreme dominance in psychiatric disorders were excluded, but were included in false negative cases of EPDS may be associated with higher the study by Ikeda et al.13) In the study by Ikeda et al., all PDPI-R cut-off values. In addition, differences in the manner subjects were urban women without a low socio-economic by which the EPDS examination was conducted, interviews or status and with a high education level, which was significantly self-report questionnaires, may produce different PDPI-R cut- different from our study on primi-, multiparous women, in off values. Moreover, differences in the EPDS cut-off values which a quarter of women had a low socio-economic status. may influence PDPI-R cut-off values. Low cut-off values for Furthermore, we performed a prenatal examination within EPDS may be associated with low cut-off values for PDPI-R. to the cut-off value of PDPI-R. postpartum cut-off value was 8.0 in the Japanese version. 〔17〕 Japanese version of PDPI-R Acknowledgments However, this possibility may be denied by the relatively low EPDS cut-off value (9.0) with a high cut-off value for PDPI-R in our study and Ikeda’s study,13) and the relatively high EPDS This study was supported by JSPS KAKENHI Grant cut-off value (13.0) with a low cut-off value for PDPI-R in the Number 25463480. We appreciate the cooperation of Tom study by Oppo et al.19) Ijyuin, MD, Mitsuhiro Nakae, MD, Shinichi Yamamoto, MD Other than a prenatal examination of PDPI-R, the ideal timing of the postpartum PDPI-R examination currently in generously collecting data for our study. We also thank to all women who participated in this study. remains unclear. Maternity blues is a strong predictor of the development of PPD,10, 17, 20, 27, 30-34) occurs within the first few days of delivery, and continues for one week. Therefore, one to two weeks after delivery may be the ideal timing for the References early identification of the risk factors for PPD using PDPI-R. 1. Kumar R, Robson KM. A prospective study of emotional However, mothers and babies are at home during this period. disorders in childbearing women. Br J of Psychiatry 1984 The first month after delivery is the most critical timing for ; 144 : 35-47. 39) In 2. Gaillard A, Strat YL, Mandelbrot L, Keita H, Dubertret C. addition, in Japan, mothers and babies routinely visit hospitals Predictor of postpartum depression: Prospective study of for health check-ups one month after delivery. 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Postpartum Depression Predictors Inventory-Revised (PDPI-R) 日本語版による 産後うつ病発生の予測に関する検討 若松美貴代1*)、中村雅之2)、春日井基文2)、肝付洋2)、沖利通3)、折田有史3)、戸上真一3)、 小林裕明3)、佐野輝2)、堂地勉3) 1) 鹿児島大学医学部保健学科 看護学専攻 母性・小児看護学講座 2) 鹿児島大学大学院 医歯学総合研究科 社会・行動医学講座 精神機能病学分野 3) 鹿児島大学大学院 医歯学総合研究科 発生発達成育学講座 生殖病態生理学分野 目的:産後うつ病(Postpartum Depression:PPD)は本人の自殺,パートナーや子供のメンタルヘルス,認知機能,社 会的・情緒的発達,虐待とも関連する。PPD 関連の自殺者は産科出血による死亡数より多いとする報告もある。故に 妊娠中,産褥早期にリスク因子を見つけてケアすることが重要である。今回米国で開発された Postpartum Depression Predictors Inventory-Revised ( PDPI-R ) を産褥期だけでなく妊娠中にも検査し,PPD を妊娠期に予測出来るか否かを検 討した。 方法:2012 年 12 月から 2015 年 2 月までに,鹿児島県内産婦人科に通院中,または入院中の妊婦で精神科疾患の既 往がなく研究同意が得られた者を対象とした。PDPI-R は日本語に翻訳した後に逆翻訳し,原尺度と比較検討し日本語, 英語について整合性の得られたもので日本語翻訳を完成させた。妊娠 10-23 週に PDPI-R ( 自己評価票 ) 産前版(social support の欠如,life stress などのリスク因子 10 項目,0-32 点満点)と産褥1ヶ月に PDPI-R 産後版(産前版 10 項目 + 育児ストレス,子どもの気質,maternity blues のリスク因子 3 項目,合計 13 項目,0-39 点満点)を実施し産前と 産後の 2 時点で完全に解答し終えた 120 人を対象とした。PPD のスクリーニングはエジンバラ産後うつ病自己評価票 9 点以上とした。Receiver operating characteristic curve を用いて,PDPI-R の妥当な cut-off 値を決め,PPD のハイリス ク群が予測出来るか否かを検討した。 結果:1)PPD は 12 人(10%)であった。2)妊娠中 PDPI-R の cut-off 値を 7.0 に決定したとき,PPD 予測の感度は 50.0%(6/12),特異度は 87.0%(94/108)であり,cut-off 値 6.0,8.0 のそれらに比較して優れていた。陽性,陰性 的中率も 7.0 が優れていた。3)産褥期 PDPI-R の cut-off 値を 8.0 にしたとき,感度は 66.7%(8/12),特異度 88.0% (95/108)であり,cut-off 値 7.0 と 9.0 のそれらに比較して優れていた。陽性,陰性的中率も 8.0 が優れていた。 結論:PDPI-R 日本語版は産褥期だけでなく妊娠中から産後うつ病のハイリスク群を予測できる有用な方法である。本 研究での PDPI-R の cut-off 値は妊娠中で 7.0,産褥 1 ヶ月で 8.0 が妥当であると思われた。我々の設定した cut-off 値は 本邦の他の報告と類似するが,欧米の報告より cut-off 値が高かった。
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